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# PS370 Research Methods in Psychology Online Exam 3 Answers (Ashworth College)

## (NOTE) NOT A. EITHER)

(NOTE) NOT A. EITHER) Question 5 of 20 5.0/ 5.0 Points When using SPSS for Windows to compute a regression line, you should also request a __________ to see how well the data fits a straight line function. A. product-moment correlation B. scatter plot C. MANOVA D. median graph Question 6 of 20 0.0/ 5.0 Points Which correlation represents the strongest relationship? A. +.37 B. +.68 C. -.02 D. -.73 Question 7 of 20 5.0/ 5.0 Points As group size increases: A. frequency polygons appear more jagged. B. histograms will look like normal curves. C. frequency polygons appear smoother. D. frequency polygons will look like normal curves. Question 8 of 20 5.0/ 5.0 Points In a study on the effects of a new type of soft lighting on task efficiency using two groups of office workers as the participants, what is the null hypothesis? A. There will be no task efficiency difference between the groups in the two conditions. B. The effects of the lights on one group will be nullified by the effects on the other group. C. The new type of lighting will lead to greater task efficiency. D. The new type of lighting will lead to lower task efficiency. Question 9 of 20 5.0/ 5.0 Points A researcher wants to study all 2000 college graduates from the University of Hawaii. She gathers data from all the college graduates at the University of Hawaii in the year 2000. She has studied a: A. reference group. B. sample. C. population. D. statistic. Question 10 of 20 5.0/ 5.0 Points The association between two variables is best indexed by the: A. standard deviation. B. variance. C. sum of squares. D. correlation coefficient. Question 11 of 20 5.0/ 5.0 Points The purpose of descriptive statistics is to: A. determine if the sample data accurately describe the population. B. simplify and organize large sets of data.

C. help us decide whether population means are equal. D. All of the above Question 12 of 20 5.0/ 5.0 Points In a study on bruxism (grinding of the teeth), participants recorded for six months the number of times per day they experienced facial pain. The data described above can be represented pictorially by a graph called a: A. frequency parabola. B. biaxial distribution. C. frequency tetrahedron. D. frequency polygon. Question 13 of 20 5.0/ 5.0 Points In a study on medication compliance in residents of a skilled nursing facility, the researcher wants to do a "median split." Where would the researcher find the median of the distribution of compliance scores? A. At the 30th percentile B. At the 50th percentile C. At the 100th percentile D. At the same point as the mode of the distribution Question 14 of 20 5.0/ 5.0 Points An advantage of a frequency polygon is that: A. two frequency distributions can be compared on the same graph. B. only one frequency distribution can be plotted on one graph. C. no further statistical analysis is necessary. D. the data need no explanation or interpretation. Question 15 of 20 5.0/ 5.0 Points The goal in psychological experimentation is to show that differences on dependent measures are due to: A. preexisting individual differences. B. research manipulations. C. research manipulations and measurement error. D. individual differences that were manipulated by the researcher. Question 16 of 20 5.0/ 5.0 Points In a classroom for gifted students, we would expect the distribution of IQ scores to be: A. rectilinear. B. identical. C. skewed. D. symmetric. Question 17 of 20 5.0/ 5.0 Points Statistical simplification for nominal or ordinal data is often done by using: A. a t-test. B. frequency distributions. C. means. D. standard deviations. Question 18 of 20 5.0/ 5.0 Points As effect size increases: A. power will increase. B. power will decrease. C. power is unchanged. D. the sample size increases. Question 19 of 20 5.0/ 5.0 Points What is the appropriate statistical procedure for evaluating the difference among two or more groups?

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